Thanks for the pointers from everyone. I'm goiing to take a look for
the throttle pot this afternoon whilst its still fine weather. I had
suspicions that it might be pot as I "think" it is developing a
slightly non linear response to my foot position although once you get
an idea in your head its all to easy to convince yourself of something
:-(
The logic about high resistance is good thinking - if the vehicle
designers are logical people?